Abstract: A bleaching apparatus comprises a measurement chamber has a first substance, the amount of the first substance in the measurement chamber being known. A dosing unit inputs a second substance to the measurement chamber for causing a chemical reaction between the first substance and the second substance, one of the first substance and the second substance being chlorine dioxide and another of the first substance and the second substance being filtered sample from pulp slurry of a pulp process. At least one sensor performs detection of a property known to depend on the chemical reaction between the first substance and the second substance as a function of time. A data processing unit determines chemical demand of chlorine dioxide for washing loss in a bleaching sub-process on the basis of at least one value in the detected property within a known period of time after the input of the second substance.

Abstract: A bleaching apparatus comprises a measurement chamber has a first substance, the amount of the first substance in the measurement chamber being known. A dosing unit inputs a second substance to the measurement chamber for causing a chemical reaction between the first substance and the second substance, one of the first substance and the second substance being chlorine dioxide and another of the first substance and the second substance being filtered sample from pulp slurry of a pulp process. At least one sensor performs detection of a property known to depend on the chemical reaction between the first substance and the second substance as a function of time. A data processing unit determines chemical demand of chlorine dioxide for washing loss in a bleaching sub-process on the basis of at least one value in the detected property within a known period of time after the input of the second substance.

Abstract: A measuring part measures the amount of matter dispersed in a suspension on the basis of a measurement, in which electromagnetic radiation interacts with the suspension, and the proportional volume of a free gas contained in the suspension on the basis of a measurement of electrical conductivity and/or impedance distribution for determining the amount of dispersed solid matter in the suspension.

Abstract: A measuring part measures the amount of matter dispersed in a suspension on the basis of a measurement, in which electromagnetic radiation interacts with the suspension, and the proportional volume of a free gas contained in the suspension on the basis of a measurement of electrical conductivity and/or impedance distribution for determining the amount of dispersed solid matter in the suspension.

Abstract: The invention relates to a method and a measurement device for measuring a suspension which contains wood fibers, the method comprising directing optical radiation at pulp and measuring optical radiation emitted by the pulp. The solution comprises measuring at least one of the following two properties; kappa number and brightness. The solution comprises changing the pulp consistency in a desired range of consistency extending from a desired initial consistency to a desired final consistency. The pulp consistency and the strength of a desired wavelength from the optical radiation are measured in the desired consistency range. Measurement points are modeled with a function of the desired type by fitting the parameters of the function according to the measurement points. Finally at least one of the following two properties of the pulp is determined by means of the modeling function; kappa number and brightness.

Abstract: The invention relates to a method and a measurement device for measuring a suspension which contains wood fibers, the method comprising directing optical radiation at pulp and measuring optical radiation emitted by the pulp. The solution comprises measuring at least one of the following two properties: kappa number and brightness. The solution comprises changing the pulp consistency in a desired range of consistency extending from a desired initial consistency to a desired final consistency. The pulp consistency and the strength of a desired wavelength from the optical radiation are measured in the desired consistency range. Measurement points are modeled with a function of the desired type by fitting the parameters of the function according to the measurement points. Finally at least one of the following two properties of the pulp is determined by means of the modeling function: kappa number and brightness.

Abstract: The invention relates to an optical measuring arrangement for measuring, particularly for liquid or gaseous substances (103). The measuring arrangement comprises at least one measuring head (104, 106) operating on an optical measuring band, and a measuring head holder (100) comprising a hole (108, 112) for fastening and supporting the measuring head (104, 106). In the hole, the holder (100) comprises an end piece (110) through which the measurement is to be made. On the optical band of the measuring head (104, 106), the end piece (110) is substantially transparent. Furthermore, the end piece (110) separates the measuring head from the substance (103) to be measured disposed in the measuring area (102).